freed. They are soon joined by the Doctor and Rory, now a museum guard, and get chased by a Dalek restored by the light of the Pandorica. The Doctor uses the vortex manipulator to go back and give Rory his screwdriver. As the universe continues to collapse, Amelia disappears. The Doctor discovers that the "sun" is the still-exploding TARDIS; River, trapped inside the TARDIS, is being kept alive in a time loop. The Doctor saves River. The Doctor creates a diversion for the Dalek, allowing him to rig the Pandorica to fly into the TARDIS explosion, using what exists of the original universe inside the Pandorica to create a second Big Bang. Before this, the Doctor instructs Amy to focus on her family and Rory to restore them in the new universe. The Doctor begins witnessing events in his life in reverse as the cracks in the universe close. The Doctor has to stay outside this new universe for that to happen. After a final goodbye to Amelia on the night they met, he enters the cracks and disappears. Amy wakes in her home in 2010 to discover that her parents and Rory have been brought back into existence. Amy and Rory celebrate their wedding day. At the reception, River leaves her diary for Amy which prompts Amy to recall the Doctor. She interrupts her father's speech, imploring the Doctor to come to the wedding. The TARDIS and the Doctor appear at the reception. Aboard the TARDIS, the Doctor explains to Amy and Rory that unanswered questions remain about the TARDIS explosion. Production Writing Aspects of "The Big Bang" were outlined by lead writer and executive producer Steven Moffat as he planned the arc of the series. Moffat stated he left room to improvise on the story and was pleased with the result, describing it as "mad" and "amazing". Moffat stated that the title "The Big Bang" is his favourite dirty Doctor Who joke as it is a reference to the fact that Amy and Rory conceive their child on the TARDIS that night, as revealed in the next series in "A Good Man Goes to War". Gillan described Rory's vigil for Amy as the "ultimate romantic gesture" which showed how much he loved Amy, and was where Amy realised how much she loved him. Moffat thought that standing guard for two thousand years would make up for shooting her.